Malicious PDF — malware analysis report

Static analysis result for SHA-256 066a68e55f899ab2…

MALICIOUS

PDF

77.2 KB Created: 2021-05-26 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce47aa85a97105669b73a7e8905f382 SHA-1: 7a7877b5ec251fc3036629f3e0d637b29db33416 SHA-256: 066a68e55f899ab2642ecd205c1022fdaca992c5bd40ea0e853c61a9bd1b5bf6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying a PDF link farm. One prominent external URI, 'https://baarspo.ru/strik?utm_term=ap+environmental+science+book+for+sale', is directly linked to the document's apparent lure of offering a book for sale. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=ap+environmental+science+book+for+sale
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/jofazowe.pdf
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/2775421.pdf
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f7c77a220.pdf
    • https://cdn-cms.f-static.net/uploads/4486346/normal_605617bd54f5f.pdf
    • https://cdn-cms.f-static.net/uploads/4499300/normal_6040fb1e27d62.pdf
    • https://cdn-cms.f-static.net/uploads/4460070/normal_606622d447bbb.pdf
    • https://cdn-cms.f-static.net/uploads/4413564/normal_60291e701138e.pdf
    • https://cdn-cms.f-static.net/uploads/4424009/normal_60677570cace0.pdf
    • https://cdn-cms.f-static.net/uploads/4413713/normal_5fd8caae19f73.pdf
    • https://cdn-cms.f-static.net/uploads/4424951/normal_600f3e3435c6d.pdf
    • https://static.s123-cdn-static.com/uploads/4413697/normal_5ff578fd71c2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/widetunipet/farov.pdf
    • https://s3.amazonaws.com/vaxebisapesi/how_to_clean_ge_monogram_dishwasher.pdf
    • https://s3.amazonaws.com/libusamagowuvo/first_alert_3120b_smoke_detector.pdf
    • https://s3.amazonaws.com/widofafane/tisebezixiruxiwejed.pdf
    • https://s3.amazonaws.com/wemazun/51021436108.pdf
    • https://s3.amazonaws.com/lovetijif/nubuv.pdf
    • https://s3.amazonaws.com/gavapozalilup/wuvatav.pdf
    • https://s3.amazonaws.com/wizomoravazub/btp_administracion_hotelera.pdf
    • https://s3.amazonaws.com/daraniwekamidir/61121795019.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/47921204708.pdf
    • https://s3.amazonaws.com/fapaga/how_do_i_turn_off_smart_call_on_samsung.pdf
    • https://s3.amazonaws.com/tadevewuju/50798921346.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin
a19a34789444be71d79d78778172a42019913f073c55a056ea97ed197927311a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 5200 bytes
font_01_sfnt_off0000f239.bin
2cfaa9adaacd243a2e834546b161bd0a355500aec3a0c5ea081ed0ba99412acd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10924 bytes
font_02_sfnt_off00011746.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 4324 bytes

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